/**
 * AWS Step Functions workflow orchestration integration
 * Provides workflow orchestration capabilities for credential issuance and management
 */

export interface StepFunctionsConfig {
  region?: string;
  stateMachineArn?: string;
}

export interface CredentialIssuanceWorkflowInput {
  subjectDid: string;
  credentialType: string[];
  credentialSubject: Record<string, unknown>;
  expirationDate?: Date;
  metadata?: Record<string, unknown>;
}

export interface CredentialIssuanceWorkflowOutput {
  credentialId: string;
  status: 'issued' | 'failed';
  error?: string;
}

/**
 * AWS Step Functions client (placeholder for actual Step Functions integration)
 * In production, this would use @aws-sdk/client-sfn
 */
export class StepFunctionsWorkflowClient {
  private config: Required<StepFunctionsConfig>;

  constructor(config: StepFunctionsConfig = {}) {
    this.config = {
      region: config.region || 'us-east-1',
      stateMachineArn: config.stateMachineArn || '',
    };
  }

  /**
   * Start a credential issuance workflow
   */
  async startCredentialIssuanceWorkflow(
    input: CredentialIssuanceWorkflowInput
  ): Promise<string> {
    // Placeholder: In production, this would use Step Functions client
    // const client = new SFNClient({ region: this.config.region });
    // const command = new StartExecutionCommand({
    //   stateMachineArn: this.config.stateMachineArn,
    //   input: JSON.stringify(input),
    // });
    // const response = await client.send(command);
    // return response.executionArn;

    console.log('Starting credential issuance workflow via Step Functions:', input);
    return `arn:aws:states:${this.config.region}:123456789012:execution:credential-issuance:${Date.now()}`;
  }

  /**
   * Get workflow execution status
   */
  async getWorkflowStatus(_executionArn: string): Promise<{
    status: 'running' | 'succeeded' | 'failed' | 'timed_out' | 'aborted';
    result?: CredentialIssuanceWorkflowOutput;
    error?: string;
  }> {
    // Placeholder: In production, this would query Step Functions
    // const client = new SFNClient({ region: this.config.region });
    // const command = new DescribeExecutionCommand({ executionArn });
    // const response = await client.send(command);
    // return { status: response.status, ... };

    return {
      status: 'running',
    };
  }

  /**
   * Stop a workflow execution
   */
  async stopWorkflow(executionArn: string, error?: string): Promise<void> {
    // Placeholder: In production, this would stop via Step Functions client
    // const client = new SFNClient({ region: this.config.region });
    // const command = new StopExecutionCommand({ executionArn, error });
    // await client.send(command);

    console.log('Stopping workflow:', executionArn, error);
  }
}

/**
 * Get Step Functions workflow client instance
 */
let workflowClient: StepFunctionsWorkflowClient | null = null;

export function getStepFunctionsWorkflowClient(
  config?: StepFunctionsConfig
): StepFunctionsWorkflowClient {
  if (!workflowClient) {
    workflowClient = new StepFunctionsWorkflowClient(config);
  }
  return workflowClient;
}
